/* Do not modify this file. Changes will be overwritten.                      */

/* Generated automatically by the ASN.1 to Wireshark dissector compiler       */

/* packet-rtse.c                                                              */

/* asn2wrs.py -b -q -L -p rtse -c ./rtse.cnf -s ./packet-rtse-template -D . -O ../.. rtse.asn */

/* packet-rtse-template.c

 * Routines for RTSE packet dissection

 * Graeme Lunt 2005

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/conversation.h>

#include <epan/prefs.h>

#include <epan/reassemble.h>

#include <epan/asn1.h>

#include <epan/expert.h>

#include <wsutil/array.h>

#include <wsutil/str_util.h>

#include "packet-ber.h"

#include "packet-pres.h"

#include "packet-acse.h"

#include "packet-ros.h"

#include "packet-rtse.h"

void proto_register_rtse(void);

void proto_reg_handoff_rtse(void);

/* Initialize the protocol and registered fields */

static int proto_rtse;

static bool open_request=false;

static uint32_t app_proto=0;

static proto_tree *top_tree;

/* Preferences */

static bool rtse_reassemble = true;

static int hf_rtse_rtorq_apdu;                    /* RTORQapdu */

static int hf_rtse_rtoac_apdu;                    /* RTOACapdu */

static int hf_rtse_rtorj_apdu;                    /* RTORJapdu */

static int hf_rtse_rttp_apdu;                     /* RTTPapdu */

static int hf_rtse_rttr_apdu;                     /* RTTRapdu */

static int hf_rtse_rtab_apdu;                     /* RTABapdu */

static int hf_rtse_checkpointSize;                /* INTEGER */

static int hf_rtse_windowSize;                    /* INTEGER */

static int hf_rtse_dialogueMode;                  /* T_dialogueMode */

static int hf_rtse_connectionDataRQ;              /* ConnectionData */

static int hf_rtse_applicationProtocol;           /* T_applicationProtocol */

static int hf_rtse_connectionDataAC;              /* ConnectionData */

static int hf_rtse_refuseReason;                  /* RefuseReason */

static int hf_rtse_userDataRJ;                    /* T_userDataRJ */

static int hf_rtse_abortReason;                   /* AbortReason */

static int hf_rtse_reflectedParameter;            /* BIT_STRING */

static int hf_rtse_userdataAB;                    /* T_userdataAB */

static int hf_rtse_open;                          /* T_open */

static int hf_rtse_recover;                       /* SessionConnectionIdentifier */

static int hf_rtse_callingSSuserReference;        /* CallingSSuserReference */

static int hf_rtse_commonReference;               /* CommonReference */

static int hf_rtse_additionalReferenceInformation;  /* AdditionalReferenceInformation */

static int hf_rtse_t61String;                     /* T_t61String */

static int hf_rtse_octetString;                   /* T_octetString */

/* Initialize the subtree pointers */

static int ett_rtse;

static int ett_rtse_RTSE_apdus;

static int ett_rtse_RTORQapdu;

static int ett_rtse_RTOACapdu;

static int ett_rtse_RTORJapdu;

static int ett_rtse_RTABapdu;

static int ett_rtse_ConnectionData;

static int ett_rtse_SessionConnectionIdentifier;

static int ett_rtse_CallingSSuserReference;

static expert_field ei_rtse_dissector_oid_not_implemented;

static expert_field ei_rtse_unknown_rtse_pdu;

static expert_field ei_rtse_abstract_syntax;

static dissector_table_t rtse_oid_dissector_table;

static dissector_handle_t rtse_handle;

static int ett_rtse_unknown;

static reassembly_table rtse_reassembly_table;

static int hf_rtse_segment_data;

static int hf_rtse_fragments;

static int hf_rtse_fragment;

static int hf_rtse_fragment_overlap;

static int hf_rtse_fragment_overlap_conflicts;

static int hf_rtse_fragment_multiple_tails;

static int hf_rtse_fragment_too_long_fragment;

static int hf_rtse_fragment_error;

static int hf_rtse_fragment_count;

static int hf_rtse_reassembled_in;

static int hf_rtse_reassembled_length;

static int ett_rtse_fragment;

static int ett_rtse_fragments;

static const fragment_items rtse_frag_items = {

    /* Fragment subtrees */

    &ett_rtse_fragment,

    &ett_rtse_fragments,

    /* Fragment fields */

    &hf_rtse_fragments,

    &hf_rtse_fragment,

    &hf_rtse_fragment_overlap,

    &hf_rtse_fragment_overlap_conflicts,

    &hf_rtse_fragment_multiple_tails,

    &hf_rtse_fragment_too_long_fragment,

    &hf_rtse_fragment_error,

    &hf_rtse_fragment_count,

    /* Reassembled in field */

    &hf_rtse_reassembled_in,

    /* Reassembled length field */

    &hf_rtse_reassembled_length,

    /* Reassembled data field */

    NULL,

    /* Tag */

    "RTSE fragments"

};

void

register_rtse_oid_dissector_handle(const char *oid, dissector_handle_t dissector, int proto, const char *name, bool uses_ros)

{

/* XXX: Note that this fcn is called from proto_reg_handoff in *other* dissectors ... */

  static  dissector_handle_t ros_handle = NULL;

  if (ros_handle == NULL)

    ros_handle = find_dissector("ros");

  /* register RTSE with the BER (ACSE) */

  register_ber_oid_dissector_handle(oid, rtse_handle, proto, name);

  if (uses_ros) {

    /* make sure we call ROS ... */

    dissector_add_string("rtse.oid", oid, ros_handle);

    /* and then tell ROS how to dissect the AS*/

    if (dissector != NULL)

      register_ros_oid_dissector_handle(oid, dissector, proto, name, true);

  } else {

    /* otherwise we just remember how to dissect the AS */

    dissector_add_string("rtse.oid", oid, dissector);

  }

}

static int

call_rtse_oid_callback(const char *oid, tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, void* data)

{

    tvbuff_t *next_tvb;

    int len;

    next_tvb = tvb_new_subset_remaining(tvb, offset);

    if ((len = dissector_try_string_with_data(rtse_oid_dissector_table, oid, next_tvb, pinfo, tree, true, data)) == 0) {

        proto_item *item;

        proto_tree *next_tree;

        next_tree = proto_tree_add_subtree_format(tree, next_tvb, 0, -1, ett_rtse_unknown, &item,

                "RTSE: Dissector for OID:%s not implemented. Contact Wireshark developers if you want this supported", oid);

        expert_add_info_format(pinfo, item, &ei_rtse_dissector_oid_not_implemented,

                                       "RTSE: Dissector for OID %s not implemented", oid);

        len = dissect_unknown_ber(pinfo, next_tvb, offset, next_tree);

    }

    offset += len;

    return offset;

}

static unsigned

call_rtse_external_type_callback(bool implicit_tag _U_, tvbuff_t *tvb, unsigned offset, asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_)

{

    const char    *oid = NULL;

    if (actx->external.indirect_ref_present) {

        oid = (const char *)find_oid_by_pres_ctx_id(actx->pinfo, actx->external.indirect_reference);

        if (!oid)

            proto_tree_add_expert_format(tree, actx->pinfo, &ei_rtse_abstract_syntax, tvb, offset, tvb_captured_length_remaining(tvb, offset),

                    "Unable to determine abstract syntax for indirect reference: %d.", actx->external.indirect_reference);

    } else if (actx->external.direct_ref_present) {

        oid = actx->external.direct_reference;

    }

    if (oid)

        offset = call_rtse_oid_callback(oid, tvb, offset, actx->pinfo, top_tree ? top_tree : tree, actx->private_data);

    return offset;

}

static unsigned

dissect_rtse_INTEGER(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,

                                                NULL);

  return offset;

}

static const value_string rtse_T_dialogueMode_vals[] = {

  {   0, "monologue" },

  {   1, "twa" },

  { 0, NULL }

};

static unsigned

dissect_rtse_T_dialogueMode(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,

                                                NULL);

  return offset;

}

static unsigned

dissect_rtse_T_open(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

        struct SESSION_DATA_STRUCTURE* session = (struct SESSION_DATA_STRUCTURE*)actx->private_data;

        const char *oid = NULL;

        switch(app_proto)  {

        case 1:         /* mts-transfer-protocol-1984 */

                oid = "applicationProtocol.1";

                break;

        case 12:        /* mts-transfer-protocol */

                oid = "applicationProtocol.12";

                break;

        default:

                if(session && session->pres_ctx_id)

                        oid = find_oid_by_pres_ctx_id(actx->pinfo, session->pres_ctx_id);

                break;

        }

        if(!oid) /* XXX: problem here is we haven't decoded the applicationProtocol yet - so we make assumptions! */

                oid = "applicationProtocol.12";

        if(oid) {

                offset = call_rtse_oid_callback(oid, tvb, offset, actx->pinfo, top_tree ? top_tree : tree, session);

        }

        /* else XXX: need to flag we can't find the presentation context */

  return offset;

}

static unsigned

dissect_rtse_T_t61String(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  tvbuff_t *string = NULL;

    offset = dissect_ber_restricted_string(implicit_tag, BER_UNI_TAG_TeletexString,

                                            actx, tree, tvb, offset, hf_index,

                                            &string);

  if(open_request && string)

    col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s", tvb_get_string_enc(actx->pinfo->pool, string, 0,

                                                                            tvb_reported_length(string), ENC_T61));

  return offset;

}

static unsigned

dissect_rtse_T_octetString(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  tvbuff_t *string = NULL;

    offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index,

                                       &string);

  if(open_request && string)

    col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s", tvb_format_text(actx->pinfo->pool, string, 0, tvb_reported_length(string)));

  return offset;

}

static const value_string rtse_CallingSSuserReference_vals[] = {

  {   0, "t61String" },

  {   1, "octetString" },

  { 0, NULL }

};

static const ber_choice_t CallingSSuserReference_choice[] = {

  {   0, &hf_rtse_t61String      , BER_CLASS_UNI, BER_UNI_TAG_TeletexString, BER_FLAGS_NOOWNTAG, dissect_rtse_T_t61String },

  {   1, &hf_rtse_octetString    , BER_CLASS_UNI, BER_UNI_TAG_OCTETSTRING, BER_FLAGS_NOOWNTAG, dissect_rtse_T_octetString },

  { 0, NULL, 0, 0, 0, NULL }

};

static unsigned

dissect_rtse_CallingSSuserReference(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_choice(actx, tree, tvb, offset,

                                 CallingSSuserReference_choice, hf_index, ett_rtse_CallingSSuserReference,

                                 NULL);

  return offset;

}

static unsigned

dissect_rtse_CommonReference(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  char *string = NULL;

    offset = dissect_ber_UTCTime(implicit_tag, actx, tree, tvb, offset, hf_index, &string, NULL);

  if(open_request && string)

    col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s", string);

  return offset;

}

static unsigned

dissect_rtse_AdditionalReferenceInformation(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_restricted_string(implicit_tag, BER_UNI_TAG_TeletexString,

                                            actx, tree, tvb, offset, hf_index,

                                            NULL);

  return offset;

}

static const ber_sequence_t SessionConnectionIdentifier_sequence[] = {

  { &hf_rtse_callingSSuserReference, BER_CLASS_ANY/*choice*/, -1/*choice*/, BER_FLAGS_NOOWNTAG|BER_FLAGS_NOTCHKTAG, dissect_rtse_CallingSSuserReference },

  { &hf_rtse_commonReference, BER_CLASS_UNI, BER_UNI_TAG_UTCTime, BER_FLAGS_NOOWNTAG, dissect_rtse_CommonReference },

  { &hf_rtse_additionalReferenceInformation, BER_CLASS_CON, 0, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_AdditionalReferenceInformation },

  { NULL, 0, 0, 0, NULL }

};

static unsigned

dissect_rtse_SessionConnectionIdentifier(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  if(open_request){

    col_append_str(actx->pinfo->cinfo, COL_INFO, "Recover");

  }

    offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,

                                   SessionConnectionIdentifier_sequence, hf_index, ett_rtse_SessionConnectionIdentifier);

  return offset;

}

static const value_string rtse_ConnectionData_vals[] = {

  {   0, "open" },

  {   1, "recover" },

  { 0, NULL }

};

static const ber_choice_t ConnectionData_choice[] = {

  {   0, &hf_rtse_open           , BER_CLASS_CON, 0, 0, dissect_rtse_T_open },

  {   1, &hf_rtse_recover        , BER_CLASS_CON, 1, BER_FLAGS_IMPLTAG, dissect_rtse_SessionConnectionIdentifier },

  { 0, NULL, 0, 0, 0, NULL }

};

static unsigned

dissect_rtse_ConnectionData(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_choice(actx, tree, tvb, offset,

                                 ConnectionData_choice, hf_index, ett_rtse_ConnectionData,

                                 NULL);

  return offset;

}

static const value_string rtse_T_applicationProtocol_vals[] = {

  {  12, "mts-transfer-protocol" },

  {   1, "mts-transfer-protocol-1984" },

  { 0, NULL }

};

static unsigned

dissect_rtse_T_applicationProtocol(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_integer(true, actx, tree, tvb, offset, hf_index, &app_proto);

  return offset;

}

static const ber_sequence_t RTORQapdu_set[] = {

  { &hf_rtse_checkpointSize , BER_CLASS_CON, 0, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_INTEGER },

  { &hf_rtse_windowSize     , BER_CLASS_CON, 1, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_INTEGER },

  { &hf_rtse_dialogueMode   , BER_CLASS_CON, 2, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_T_dialogueMode },

  { &hf_rtse_connectionDataRQ, BER_CLASS_CON, 3, BER_FLAGS_NOTCHKTAG, dissect_rtse_ConnectionData },

  { &hf_rtse_applicationProtocol, BER_CLASS_CON, 4, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_T_applicationProtocol },

  { NULL, 0, 0, 0, NULL }

};

unsigned

dissect_rtse_RTORQapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  struct SESSION_DATA_STRUCTURE* session = (struct SESSION_DATA_STRUCTURE*)actx->private_data;

  if(session != NULL)

        session->ros_op = (ROS_OP_BIND | ROS_OP_ARGUMENT);

  open_request=true;

    offset = dissect_ber_set(implicit_tag, actx, tree, tvb, offset,

                              RTORQapdu_set, hf_index, ett_rtse_RTORQapdu);

  open_request=false;

  return offset;

}

static const ber_sequence_t RTOACapdu_set[] = {

  { &hf_rtse_checkpointSize , BER_CLASS_CON, 0, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_INTEGER },

  { &hf_rtse_windowSize     , BER_CLASS_CON, 1, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_INTEGER },

  { &hf_rtse_connectionDataAC, BER_CLASS_CON, 2, BER_FLAGS_NOTCHKTAG, dissect_rtse_ConnectionData },

  { NULL, 0, 0, 0, NULL }

};

unsigned

dissect_rtse_RTOACapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  struct SESSION_DATA_STRUCTURE* session = (struct SESSION_DATA_STRUCTURE*)actx->private_data;

  if(session != NULL)

        session->ros_op = (ROS_OP_BIND | ROS_OP_RESULT);

    offset = dissect_ber_set(implicit_tag, actx, tree, tvb, offset,

                              RTOACapdu_set, hf_index, ett_rtse_RTOACapdu);

  return offset;

}

static const value_string rtse_RefuseReason_vals[] = {

  {   0, "rtsBusy" },

  {   1, "cannotRecover" },

  {   2, "validationFailure" },

  {   3, "unacceptableDialogueMode" },

  { 0, NULL }

};

static unsigned

dissect_rtse_RefuseReason(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  int32_t reason;

    offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,

                                                (uint32_t*)&reason);

  col_append_fstr(actx->pinfo->cinfo, COL_INFO, " (%s)", val_to_str(actx->pinfo->pool, reason, rtse_RefuseReason_vals, "reason(%d)"));

  return offset;

}

static unsigned

dissect_rtse_T_userDataRJ(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

    struct SESSION_DATA_STRUCTURE* session = (struct SESSION_DATA_STRUCTURE*)actx->private_data;

        const char *oid = NULL;

        switch(app_proto)  {

        case 1:         /* mts-transfer-protocol-1984 */

                oid = "applicationProtocol.1";

                break;

        case 12:        /* mts-transfer-protocol */

                oid = "applicationProtocol.12";

                break;

        default:

                if(session && session->pres_ctx_id)

                        oid = find_oid_by_pres_ctx_id(actx->pinfo, session->pres_ctx_id);

                break;

        }

        if(!oid) /* XXX: problem here is we haven't decoded the applicationProtocol yet - so we make assumptions! */

                oid = "applicationProtocol.12";

        if(oid) {

          if(session != NULL)

                session->ros_op = (ROS_OP_BIND | ROS_OP_ERROR);

          offset = call_rtse_oid_callback(oid, tvb, offset, actx->pinfo, top_tree ? top_tree : tree, session);

        }

  return offset;

}

static const ber_sequence_t RTORJapdu_set[] = {

  { &hf_rtse_refuseReason   , BER_CLASS_CON, 0, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_RefuseReason },

  { &hf_rtse_userDataRJ     , BER_CLASS_CON, 1, BER_FLAGS_OPTIONAL, dissect_rtse_T_userDataRJ },

  { NULL, 0, 0, 0, NULL }

};

unsigned

dissect_rtse_RTORJapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  col_append_str(actx->pinfo->cinfo, COL_INFO, "Refuse");

    offset = dissect_ber_set(implicit_tag, actx, tree, tvb, offset,

                              RTORJapdu_set, hf_index, ett_rtse_RTORJapdu);

  return offset;

}

static unsigned

dissect_rtse_RTTPapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  int32_t priority;

  col_append_str(actx->pinfo->cinfo, COL_INFO, "Turn-Please");

    offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,

                                                (uint32_t*)&priority);

  col_append_fstr(actx->pinfo->cinfo, COL_INFO, " (%d)", priority);

  return offset;

}

static unsigned

dissect_rtse_RTTRapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

        tvbuff_t *next_tvb = NULL;

    struct SESSION_DATA_STRUCTURE* session = (struct SESSION_DATA_STRUCTURE*)actx->private_data;

        offset = dissect_ber_octet_string(false, actx, tree, tvb, offset, hf_index, &next_tvb);

        if(next_tvb) {

                /* XXX: we should check is this is an EXTERNAL first */

                /* ROS won't do this for us */

                if(session)

                        session->ros_op = (ROS_OP_INVOKE | ROS_OP_ARGUMENT);

                offset = dissect_ber_external_type(false, tree, next_tvb, 0, actx,  -1, call_rtse_external_type_callback);

        }

  return offset;

}

static const value_string rtse_AbortReason_vals[] = {

  {   0, "localSystemProblem" },

  {   1, "invalidParameter" },

  {   2, "unrecognizedActivity" },

  {   3, "temporaryProblem" },

  {   4, "protocolError" },

  {   5, "permanentProblem" },

  {   6, "userError" },

  {   7, "transferCompleted" },

  { 0, NULL }

};

static unsigned

dissect_rtse_AbortReason(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  int32_t reason = -1;

    offset = dissect_ber_integer(implicit_tag, actx, tree, tvb, offset, hf_index,

                                                (uint32_t*)&reason);

  col_append_fstr(actx->pinfo->cinfo, COL_INFO, " (%s)", val_to_str(actx->pinfo->pool, reason, rtse_AbortReason_vals, "reason(%d)"));

  return offset;

}

static unsigned

dissect_rtse_BIT_STRING(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_bitstring(implicit_tag, actx, tree, tvb, offset,

                                    NULL, 0, hf_index, -1,

                                    NULL);

  return offset;

}

static unsigned

dissect_rtse_T_userdataAB(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

/*XXX not implemented yet */

  return offset;

}

static const ber_sequence_t RTABapdu_set[] = {

  { &hf_rtse_abortReason    , BER_CLASS_CON, 0, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_AbortReason },

  { &hf_rtse_reflectedParameter, BER_CLASS_CON, 1, BER_FLAGS_OPTIONAL|BER_FLAGS_IMPLTAG, dissect_rtse_BIT_STRING },

  { &hf_rtse_userdataAB     , BER_CLASS_CON, 2, BER_FLAGS_OPTIONAL, dissect_rtse_T_userdataAB },

  { NULL, 0, 0, 0, NULL }

};

unsigned

dissect_rtse_RTABapdu(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  col_append_str(actx->pinfo->cinfo, COL_INFO, "Abort");

    offset = dissect_ber_set(implicit_tag, actx, tree, tvb, offset,

                              RTABapdu_set, hf_index, ett_rtse_RTABapdu);

  return offset;

}

static const ber_choice_t RTSE_apdus_choice[] = {

  {   0, &hf_rtse_rtorq_apdu     , BER_CLASS_CON, 16, BER_FLAGS_IMPLTAG, dissect_rtse_RTORQapdu },

  {   1, &hf_rtse_rtoac_apdu     , BER_CLASS_CON, 17, BER_FLAGS_IMPLTAG, dissect_rtse_RTOACapdu },

  {   2, &hf_rtse_rtorj_apdu     , BER_CLASS_CON, 18, BER_FLAGS_IMPLTAG, dissect_rtse_RTORJapdu },

  {   3, &hf_rtse_rttp_apdu      , BER_CLASS_UNI, BER_UNI_TAG_INTEGER, BER_FLAGS_NOOWNTAG, dissect_rtse_RTTPapdu },

  {   4, &hf_rtse_rttr_apdu      , BER_CLASS_UNI, BER_UNI_TAG_OCTETSTRING, BER_FLAGS_NOOWNTAG, dissect_rtse_RTTRapdu },

  {   5, &hf_rtse_rtab_apdu      , BER_CLASS_CON, 22, BER_FLAGS_IMPLTAG, dissect_rtse_RTABapdu },

  { 0, NULL, 0, 0, 0, NULL }

};

static unsigned

dissect_rtse_RTSE_apdus(bool implicit_tag _U_, tvbuff_t *tvb _U_, unsigned offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {

  offset = dissect_ber_choice(actx, tree, tvb, offset,

                                 RTSE_apdus_choice, hf_index, ett_rtse_RTSE_apdus,

                                 NULL);

  return offset;

}

/*

* Dissect RTSE PDUs inside a PPDU.

*/

static int

dissect_rtse(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data)

{

    unsigned offset = 0;

    unsigned old_offset;

    proto_item *item;

    proto_tree *tree;

    proto_tree *next_tree=NULL;

    tvbuff_t *next_tvb = NULL;

    tvbuff_t *data_tvb = NULL;

    fragment_head *frag_msg = NULL;

    uint32_t fragment_length;

    uint32_t rtse_id = 0;

    bool data_handled = false;

    struct SESSION_DATA_STRUCTURE* session;

    conversation_t *conversation = NULL;

    asn1_ctx_t asn1_ctx;

    asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, true, pinfo);

    /* do we have application context from the acse dissector? */

    if (data == NULL)

        return 0;

    session = (struct SESSION_DATA_STRUCTURE*)data;

    /* save parent_tree so subdissectors can create new top nodes */

    top_tree=parent_tree;

    asn1_ctx.private_data = session;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTSE");

    col_clear(pinfo->cinfo, COL_INFO);

    if (rtse_reassemble &&

        ((session->spdu_type == SES_DATA_TRANSFER) ||

         (session->spdu_type == SES_MAJOR_SYNC_POINT)))

    {

        /* Use conversation index as fragment id */

        conversation  = find_conversation_pinfo(pinfo, 0);

        if (conversation != NULL) {

            rtse_id = conversation->conv_index;

        }

        session->rtse_reassemble = true;

    }

    if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {

        frag_msg = fragment_end_seq_next (&rtse_reassembly_table,

                          pinfo, rtse_id, NULL);

        next_tvb = process_reassembled_data (tvb, offset, pinfo, "Reassembled RTSE",

                             frag_msg, &rtse_frag_items, NULL, parent_tree);

    }

    item = proto_tree_add_item(parent_tree, proto_rtse, next_tvb ? next_tvb : tvb, 0, -1, ENC_NA);

    tree = proto_item_add_subtree(item, ett_rtse);

    if (rtse_reassemble && session->spdu_type == SES_DATA_TRANSFER) {

        /* strip off the OCTET STRING encoding - including any CONSTRUCTED OCTET STRING */

        dissect_ber_octet_string(false, &asn1_ctx, tree, tvb, offset, hf_rtse_segment_data, &data_tvb);

        if (data_tvb) {

            fragment_length = tvb_captured_length_remaining (data_tvb, 0);

            proto_item_append_text(asn1_ctx.created_item, " (%u byte%s)", fragment_length,

                                        plurality(fragment_length, "", "s"));

            frag_msg = fragment_add_seq_next (&rtse_reassembly_table,

                              data_tvb, 0, pinfo,

                              rtse_id, NULL,

                              fragment_length, true);

            if (frag_msg && pinfo->num != frag_msg->reassembled_in) {

                /* Add a "Reassembled in" link if not reassembled in this frame */

                proto_tree_add_uint (tree, *(rtse_frag_items.hf_reassembled_in),

                             data_tvb, 0, 0, frag_msg->reassembled_in);

            }

            pinfo->fragmented = true;

            data_handled = true;

        } else {

            fragment_length = tvb_captured_length_remaining (tvb, offset);

        }

        col_append_fstr(pinfo->cinfo, COL_INFO, "[RTSE fragment, %u byte%s]",

                    fragment_length, plurality(fragment_length, "", "s"));

    } else if (rtse_reassemble && session->spdu_type == SES_MAJOR_SYNC_POINT) {

        if (next_tvb) {

            /* ROS won't do this for us */

            session->ros_op = (ROS_OP_INVOKE | ROS_OP_ARGUMENT);

            /*offset=*/dissect_ber_external_type(false, tree, next_tvb, 0, &asn1_ctx, -1, call_rtse_external_type_callback);

            top_tree = NULL;

            /* Return other than 0 to indicate that we handled this packet */

            return 1;

        } else {

            offset = tvb_captured_length (tvb);

        }

        pinfo->fragmented = false;

        data_handled = true;

    }

    if (!data_handled) {

        while (tvb_reported_length_remaining(tvb, offset) > 0) {

            old_offset=offset;

            offset=dissect_rtse_RTSE_apdus(true, tvb, offset, &asn1_ctx, tree, -1);

            if (offset == old_offset) {

                next_tree = proto_tree_add_subtree(tree, tvb, offset, -1,

                                ett_rtse_unknown, &item, "Unknown RTSE PDU");

                expert_add_info (pinfo, item, &ei_rtse_unknown_rtse_pdu);

                dissect_unknown_ber(pinfo, tvb, offset, next_tree);

                break;

            }

        }

    }

    top_tree = NULL;

    return tvb_captured_length(tvb);

}

/*--- proto_register_rtse -------------------------------------------*/

void proto_register_rtse(void) {

  /* List of fields */

  static hf_register_info hf[] =

  {

    /* Fragment entries */

    { &hf_rtse_segment_data,

      { "RTSE segment data", "rtse.segment", FT_NONE, BASE_NONE,

    NULL, 0x00, NULL, HFILL } },

    { &hf_rtse_fragments,

      { "RTSE fragments", "rtse.fragments", FT_NONE, BASE_NONE,

    NULL, 0x00, NULL, HFILL } },

    { &hf_rtse_fragment,

      { "RTSE fragment", "rtse.fragment", FT_FRAMENUM, BASE_NONE,

    NULL, 0x00, NULL, HFILL } },

    { &hf_rtse_fragment_overlap,

      { "RTSE fragment overlap", "rtse.fragment.overlap", FT_BOOLEAN,

    BASE_NONE, NULL, 0x0, NULL, HFILL } },

    { &hf_rtse_fragment_overlap_conflicts,

      { "RTSE fragment overlapping with conflicting data",

    "rtse.fragment.overlap.conflicts", FT_BOOLEAN, BASE_NONE,

    NULL, 0x0, NULL, HFILL } },

    { &hf_rtse_fragment_multiple_tails,

      { "RTSE has multiple tail fragments",

    "rtse.fragment.multiple_tails", FT_BOOLEAN, BASE_NONE,

    NULL, 0x0, NULL, HFILL } },

    { &hf_rtse_fragment_too_long_fragment,

      { "RTSE fragment too long", "rtse.fragment.too_long_fragment",

    FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },

    { &hf_rtse_fragment_error,

      { "RTSE defragmentation error", "rtse.fragment.error", FT_FRAMENUM,

    BASE_NONE, NULL, 0x00, NULL, HFILL } },

    { &hf_rtse_fragment_count,

      { "RTSE fragment count", "rtse.fragment.count", FT_UINT32, BASE_DEC,

    NULL, 0x00, NULL, HFILL } },

    { &hf_rtse_reassembled_in,

      { "Reassembled RTSE in frame", "rtse.reassembled.in", FT_FRAMENUM, BASE_NONE,

    NULL, 0x00, "This RTSE packet is reassembled in this frame", HFILL } },

    { &hf_rtse_reassembled_length,

      { "Reassembled RTSE length", "rtse.reassembled.length", FT_UINT32, BASE_DEC,

    NULL, 0x00, "The total length of the reassembled payload", HFILL } },

    { &hf_rtse_rtorq_apdu,

      { "rtorq-apdu", "rtse.rtorq_apdu_element",

        FT_NONE, BASE_NONE, NULL, 0,

        "RTORQapdu", HFILL }},

    { &hf_rtse_rtoac_apdu,

      { "rtoac-apdu", "rtse.rtoac_apdu_element",

        FT_NONE, BASE_NONE, NULL, 0,

        "RTOACapdu", HFILL }},

    { &hf_rtse_rtorj_apdu,

      { "rtorj-apdu", "rtse.rtorj_apdu_element",

        FT_NONE, BASE_NONE, NULL, 0,

        "RTORJapdu", HFILL }},

    { &hf_rtse_rttp_apdu,

      { "rttp-apdu", "rtse.rttp_apdu",

        FT_INT32, BASE_DEC, NULL, 0,

        "RTTPapdu", HFILL }},

    { &hf_rtse_rttr_apdu,

      { "rttr-apdu", "rtse.rttr_apdu",

        FT_BYTES, BASE_NONE, NULL, 0,

        "RTTRapdu", HFILL }},

    { &hf_rtse_rtab_apdu,

      { "rtab-apdu", "rtse.rtab_apdu_element",

        FT_NONE, BASE_NONE, NULL, 0,

        "RTABapdu", HFILL }},

    { &hf_rtse_checkpointSize,

      { "checkpointSize", "rtse.checkpointSize",

        FT_INT32, BASE_DEC, NULL, 0,

        "INTEGER", HFILL }},

    { &hf_rtse_windowSize,

      { "windowSize", "rtse.windowSize",

        FT_INT32, BASE_DEC, NULL, 0,

        "INTEGER", HFILL }},

    { &hf_rtse_dialogueMode,

      { "dialogueMode", "rtse.dialogueMode",

        FT_INT32, BASE_DEC, VALS(rtse_T_dialogueMode_vals), 0,

        NULL, HFILL }},

    { &hf_rtse_connectionDataRQ,

      { "connectionDataRQ", "rtse.connectionDataRQ",

        FT_UINT32, BASE_DEC, VALS(rtse_ConnectionData_vals), 0,

        "ConnectionData", HFILL }},

    { &hf_rtse_applicationProtocol,

      { "applicationProtocol", "rtse.applicationProtocol",

        FT_INT32, BASE_DEC, VALS(rtse_T_applicationProtocol_vals), 0,

        NULL, HFILL }},

    { &hf_rtse_connectionDataAC,

      { "connectionDataAC", "rtse.connectionDataAC",

        FT_UINT32, BASE_DEC, VALS(rtse_ConnectionData_vals), 0,

        "ConnectionData", HFILL }},

    { &hf_rtse_refuseReason,

      { "refuseReason", "rtse.refuseReason",

        FT_INT32, BASE_DEC, VALS(rtse_RefuseReason_vals), 0,

        NULL, HFILL }},

    { &hf_rtse_userDataRJ,

      { "userDataRJ", "rtse.userDataRJ_element",

        FT_NONE, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_abortReason,

      { "abortReason", "rtse.abortReason",

        FT_INT32, BASE_DEC, VALS(rtse_AbortReason_vals), 0,

        NULL, HFILL }},

    { &hf_rtse_reflectedParameter,

      { "reflectedParameter", "rtse.reflectedParameter",

        FT_BYTES, BASE_NONE, NULL, 0,

        "BIT_STRING", HFILL }},

    { &hf_rtse_userdataAB,

      { "userdataAB", "rtse.userdataAB_element",

        FT_NONE, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_open,

      { "open", "rtse.open_element",

        FT_NONE, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_recover,

      { "recover", "rtse.recover_element",

        FT_NONE, BASE_NONE, NULL, 0,

        "SessionConnectionIdentifier", HFILL }},

    { &hf_rtse_callingSSuserReference,

      { "callingSSuserReference", "rtse.callingSSuserReference",

        FT_UINT32, BASE_DEC, VALS(rtse_CallingSSuserReference_vals), 0,

        NULL, HFILL }},

    { &hf_rtse_commonReference,

      { "commonReference", "rtse.commonReference",

        FT_STRING, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_additionalReferenceInformation,

      { "additionalReferenceInformation", "rtse.additionalReferenceInformation",

        FT_STRING, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_t61String,

      { "t61String", "rtse.t61String",

        FT_STRING, BASE_NONE, NULL, 0,

        NULL, HFILL }},

    { &hf_rtse_octetString,

      { "octetString", "rtse.octetString",

        FT_BYTES, BASE_NONE, NULL, 0,

        NULL, HFILL }},

  };

  /* List of subtrees */

  static int *ett[] = {

    &ett_rtse,

    &ett_rtse_unknown,

    &ett_rtse_fragment,

    &ett_rtse_fragments,

    &ett_rtse_RTSE_apdus,

    &ett_rtse_RTORQapdu,

    &ett_rtse_RTOACapdu,

    &ett_rtse_RTORJapdu,

    &ett_rtse_RTABapdu,

    &ett_rtse_ConnectionData,

    &ett_rtse_SessionConnectionIdentifier,

    &ett_rtse_CallingSSuserReference,

  };

  static ei_register_info ei[] = {

     { &ei_rtse_dissector_oid_not_implemented, { "rtse.dissector_oid_not_implemented", PI_UNDECODED, PI_WARN, "RTSE: Dissector for OID not implemented", EXPFILL }},

     { &ei_rtse_unknown_rtse_pdu, { "rtse.unknown_rtse_pdu", PI_UNDECODED, PI_WARN, "Unknown RTSE PDU", EXPFILL }},

     { &ei_rtse_abstract_syntax, { "rtse.bad_abstract_syntax", PI_PROTOCOL, PI_WARN, "Unable to determine abstract syntax for indirect reference", EXPFILL }},

  };

  expert_module_t* expert_rtse;

  module_t *rtse_module;

  /* Register protocol */

  proto_rtse = proto_register_protocol("X.228 OSI Reliable Transfer Service", "RTSE", "rtse");

  rtse_handle = register_dissector("rtse", dissect_rtse, proto_rtse);

  /* Register fields and subtrees */

  proto_register_field_array(proto_rtse, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  expert_rtse = expert_register_protocol(proto_rtse);

  expert_register_field_array(expert_rtse, ei, array_length(ei));

  reassembly_table_register (&rtse_reassembly_table,

                   &addresses_reassembly_table_functions);

  rtse_module = prefs_register_protocol_subtree("OSI", proto_rtse, NULL);

  prefs_register_bool_preference(rtse_module, "reassemble",

                 "Reassemble segmented RTSE datagrams",

                 "Whether segmented RTSE datagrams should be reassembled."

                 " To use this option, you must also enable"

                 " \"Allow subdissectors to reassemble TCP streams\""

                 " in the TCP protocol settings.", &rtse_reassemble);

  rtse_oid_dissector_table = register_dissector_table("rtse.oid", "RTSE OID Dissectors", proto_rtse, FT_STRING, STRING_CASE_SENSITIVE);

}

/*--- proto_reg_handoff_rtse --- */

void proto_reg_handoff_rtse(void) {

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local variables:

 * c-basic-offset: 4